This new fraud is just like the old ones: its essence lies in substituting something external for the use of our own reason and conscience and that of our predecessors: in the Church teaching this external thing was revelation, in the scientific teaching it is observation. The trick played by this science is to destroy man's faith in reason and conscience by directing attention to the grossest deviations from the use of human reason and conscience, and having clothed the deception in a scientific theory, to assure them that by acquiring knowledge of external phenomena they will get to know indubitable facts which will reveal to them the law of man's life. And the mental demoralization consists in this, that coming to believe that things which should be decided by conscience and reason are decided by observation, these people lose their consciousness of good and evil and become incapable of understanding the expression and definitions of good and evil that have been formed by the whole preceding life of humanity. All this, in their jargon, is conditional and subjective. It must all be abandoned - they say - the truth cannot be understood by one's reason, for one may err, but there is another path which is infallible and almost mechanical: one must study facts. And facts must be studied on the basis of the scientists' science, that is, on the basis of two unfounded propositions: positivism and evolution which are put forward as indubitable truths.
Leo Tolstoy